DE1673462C

DE1673462C - Control valve with differential pressure control

Info

Publication number: DE1673462C
Application number: DE19671673462
Authority: DE
Inventors: Jürgen Dipl.-Ing. 7100 Heilbronn Balz
Original assignee: Helmut Baelz GmbH
Current assignee: Helmut Baelz GmbH
Priority date: 1967-11-14
Filing date: 1967-11-14
Publication date: 1973-05-03

Description

Membransteiimotor 10 angeordnet, dessen Gehäuse 11 bei 12 an das Ventilgehäuse 1 angeflanscht ist, so daß das Ganze eine konstruktiv Baueinheit bildet, die aus dem den Ventilsitz 4 und da« Ventilverschlußstück 5 umfassenden eigentlichen Ventil und aus einem im einzelnen noch zu beschreibenden, von dem Membransteiimotor IO teilweise gebildeten Differenzdruckregler besteht. Zu diesem Zwecke isi. der Membranstellmotor 10 derart angeschlossen, daß seine Membrane 13. die zwei Kammern 14. 15 abtrennt, \cn dem Differenzdruck zwischen dem Ventileinlaß 2 und dem Druck in der Bohrung 9 beaufschlagt ist. Die Beaufschlagung .!er Membrane 13 durch den am ^Λ'·;η-tileinlaß herrschenden Druck auf der einen Seite geschieht durch eine in die Kammer 14 mündende und von dem Ventileinlaß 2 abgehende Leitung 16. Die Membrane 13 ist auf der anderen Seile mit einem Federteller 17 verbunden, auf den eine Feder 18 drückt, die sich gegen das Gehäuse 11 abstützt und eine im wesentlichen konstante Feder! raft vorgibt. Mit der Membrane 13 und dem Federteller 17 ist darüber hinaus eine Spindel 19 gekuppelt, die bei 22 abgedichtet geführt ist. Da der Ventilsitz 4 bei 26 eine Dichtfläche aufweist, kann die in Gestalt einer ringsumlaufenden Schneide ausgebildete Dichtkante 27 der Spindel 19 einen dichten Abschluß der Durchflußmenge, die bei 2 eintritt, herbeizuführen. Li die Durchgangsbohrung 9 des Ventilsitzes 4 mündet ein Kanal 20. der über eine Leitung 21 mit der Kammer 15 des Stellmotors 10 verbunden ist.Membransteiimotor 10 is arranged, the housing 11 of which is flanged to the valve housing 1 at 12, so that the whole forms a structural unit consisting of the actual valve comprising the valve seat 4 and the valve closure piece 5 and of a still to be described in detail of the Membransteiimotor IO partially formed differential pressure regulator consists. For this purpose isi. the diaphragm servomotor 10 is connected in such a way that its diaphragm 13 separates the two chambers 14 15, and the differential pressure between the valve inlet 2 and the pressure in the bore 9 is applied. The application he diaphragm 13 by the on ^Λ '·;.! Η-tileinlaß pressure prevailing on one side is done by opening into the chamber 14 and outgoing from the valve inlet 2 line 16. The membrane 13 is on the other ropes with a Spring plate 17 connected, on which a spring 18 presses, which is supported against the housing 11 and a substantially constant spring! raft pretends. A spindle 19, which is guided in a sealed manner at 22, is also coupled to the diaphragm 13 and the spring plate 17. Since the valve seat 4 has a sealing surface at 26, the sealing edge 27 of the spindle 19, which is in the form of a circumferential cutting edge, can provide a tight seal for the flow rate that occurs at 2. Li the through hole 9 of the valve seat 4 opens into a channel 20 which is connected to the chamber 15 of the servomotor 10 via a line 21.

Die Membrane 13 ist über die Leitung 16 und andererseits über den Kanal 20 und die Leitung 21 mit der Differenz des Druckes p¹ am Eintritt 2 und des Druckes d¹ in der Bohrung 9 des Ventilsitzes 4 beaufschlagt. Die von der Differenz dieser Drücke auf die Membrane 13 ausgeübte Kraft ist im Ruhezustand Bleich der den Sollwert vorgebenden Federkraft der Feder 18. die be. kleinen Auslenkungen als Konstant anoesehen werden kann. Demgemäß herrscht an dem Ventilsitz 4 stets ein konstanter D.fferenzdruc^ derThe membrane 13 is acted upon via the line 16 and on the other hand via the channel 20 and the line 21 with the difference between the pressure p ¹ at inlet 2 and the pressure d ¹ in the bore 9 of the valve seat 4. The force exerted by the difference between these pressures on the diaphragm 13 is, in the rest state, bleach, of the spring force of the spring 18 which specifies the setpoint value. small deflections can be seen as constant. Accordingly, there is always a constant pressure at the valve seat 4

über den selbsttätig veränderlichen Ringspalt 23 unabhängig von den jeweiligen Betnebsverhaltn-ssen aufrechterhalten wird.via the automatically variable annular gap 23 independently of the respective employment conditions is maintained.

In die Leitune 21 ist nun ein selbstschließendes Dreiwesemaanetventil 30 eingefügt, das im erregtenIn the Leitune 21 a self-closing Dreiwesemaanetventil 30 is now inserted, which in the excited

Zustand ^Leitung 21 geöffnet hält ,wahrend se.n dritter, bei 31 in die Atmosphäre entlüftender Ausoan, verschlossen ist. Sollte nun plötzlich die S rom- «rsorgung ausfallen, so wird das Magnetventil 30 ebenfalls entregt. Es sperrt die Leitung 21 ab so daßState ^ line 21 keeps open, while se.n third Ausoan vented to atmosphere at 31, is locked. Should now suddenly the Rom- If the supply fails, the solenoid valve 30 also de-excited. It blocks the line 21 so that

der Kanal 20 des Ventilsitzes4 verschlossen ,st. wahrend gleichzeitig die dem Druck p* zugeordnete Kammer 15 des Membranstellmotors 10 mit der Atmosphäie verbunden wird, was über die Entlu tungsleitU 31 geschieht. Da die K- _;mer 14 des Membran-the channel 20 of the valve seat 4 closed, st. while at the same time the chamber 15 of the diaphragm servomotor 10, which is assigned to the pressure p * , is connected to the atmosphere, which takes place via the vent line 31. Since the K- _; mer 14 of the membrane

Stellmotors über die Leitung 16 rt.it dem Druck p> am Ventileineane beaufschlagt ist und d.e auf der gegenüberliegenden Seite der Membrane 13 befindliche Kammer entlüftet ist, wird die Membrane 13 nach oben sedrückt, so daß die Spindel 20 bei 29 denServomotor via line 16 rt. With the pressure p> is applied to the valve one and d.e on the opposite Side of the membrane 13 located chamber is vented, the membrane 13 is after sedrück above so that the spindle 20 at 29 den

a₅ Durchfluß dichtend absperrt. Bei dieser Abwärtsbewegung der Spindel 20 wird die lediglich fur einen DifferJnzdruck p'-p² bemessene Federkraft der Feder 18 überwunden, weil nun nach dem Wegfall des Drukk-s p¹ an der Membran 13 die volle Druckkraft desa ₅ sealing off the flow. During this downward movement of the spindle 20, the ^{spring force of the spring 18, which is only measured for a differential pressure p'-p 2, is} overcome because now, after the pressure p ¹ on the diaphragm 13 has ceased, the full pressure force of the

Druckes p¹ vom Ventileinlaß zur Wirkung kommtPressure p ¹ from the valve inlet comes into effect

Zur Wiederöffnen des Ventils braucht lediglich das Maenetventil 30 wieder erregt zu werden. Dann wird die" Verbindung zwischen der Kammer 15 und dem Kanal 20 wieder hergestellt, so daß in der Kam-To reopen the valve, it is only necessary to re-energize the Maenet valve 30. then the "connection between the chamber 15 and the channel 20 is restored so that in the chamber

mer 15 wieder der Druck p- herrscht und die Feder 18 die Spindel 20 wieder nach unten bewegen kann.mer 15 the pressure p- prevails again and the spring 18 can move the spindle 20 downwards again.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims

Patent claims:

1. Control valve with differential pressure control, in which an automatically variable annular gap is arranged downstream of a valve seat that interacts with an externally adjustable valve closure gap. de unilaterally by a coaxial to the Ventilversch. 'Slidable piece in the valve housing sealed guided actuator is limited, which is acted upon by the differential pressure applied to the valve seat membrane or piston actuator motor of the differential pressure (p'-p-) on the valve seat constant and with the valve to a constructive Unit combined DUTerenzpressure controller is connected. wet ei the membrane or the piston of the servomotor is under the action of a ^{spring force corresponding to the setpoint of the differential pressure to be set (p'-p 2} ), characterized in that as. Snap-lock safety device in the membrane (13) or the piston of the servomotor. (10) p- acting on the prevailing behind the valve seat (4) pressure Verbindungslei ·· device (21) a self-closing solenoid valve (30) is inserted that locks the connection pipe (211 in the non-energized state and the pressure (p) associated membrane or piston side (15) with the atmosphere.

2. Control valve according to claim 1, characterized in that the actuator as a spindle (20) is formed and on its end face delimiting the annular gap (23) a circular circumferential; Carrying cutting edge (27), which cooperate with a sealing surface: (29) on the underside of the valve seat (4) can.

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The invention relates to a control valve with differential pressure control, in which an automatically variable annular gap is arranged downstream of a valve that interacts with an externally adjustable valve closure piece and is delimited on one side by an actuator which is guided in the valve housing and is sealed with an actuator with the on The differential pressure applied to the valve seat is connected to a diaphragm or piston ^{actuator motor of a differential pressure regulator that maintains the differential pressure (p 1} -p-) constant at the valve seat and is combined with the valve to form a structural unit, the diaphragm or piston of the actuator motor under the action of one of the Setpoint of the spring force corresponding to the differential pressure to be set (p ^l -p ' ² ) is available.

A valve of this type is intended in particular for district heating systems and has the advantage that it combines the functions of three separate devices, namely those of a flow regulator, a differential pressure regulator and a motorized valve. This valve is operated using electrical energy. In the case of district heating systems in particular, it has now been found to be disadvantageous that if this electrical energy fails, the valve remains in the position it is currently in and the valve can only be closed by hand. Since under these circumstances, for example in the district heating consumer circuit, an impermissible temperature increase can occur, which is caused by the fact that the temperature in the remote heating supply is, for technical reasons, significantly higher than the temperature normally present in the consumer circuit and the consumer circuit assumes the heating supply temperature if the valve fails, have already been Safety precautions taken. So it is B. known to connect a directly controlled or auxiliary controlled solenoid valve upstream of the actual control valve, which closes automatically in the event of a power failure. However, this route is very complex and therefore relatively expensive.

On the other hand, it has already been described, for example in the German Auslegeschrift 1247 794, A safety device is directly assigned to a motorized valve for district heating systems. to For this purpose, a separation was made between the actual valve spindle and the one with the main drive motor of the motor valve coupled drive spi.idel made. The two spindles are over an auxiliary drive motor that can be operated with pressure medium coupled with each other, which adjust the valve spindle in the "sense of closing the valve" in the event of a power failure can. But this valve requires its own independent pressure medium source, which is a relative represents a great effort.

The aim of the invention is to have what was mentioned at the beginning To develop the control valve in such a way that it is immediately automatic in the event of a failure of the electrical energy closes.

For this purpose, the control valve of the type mentioned is designed according to the invention in such a way that a self-closing solenoid valve is inserted as a quick-acting safety device into the connecting line acting on the diaphragm or piston of the servomotor with the pressure p ^{1 behind the valve seat, which in the non-energized state} the connecting line blocks and connects the diaphragm or piston side assigned to pressure p- with the atmosphere.

It is useful here if the actuator is designed as a spindle and delimits the annular gap at its Front side carries a circumferential cutting edge with a sealing surface on the underside of the valve seat can cooperate.

The new valve is characterized by a fast-acting safety device, which in the event of failure the power supply from its own independent source without additional drive medium Valve closure initiated.

In the drawing, an embodiment of the subject matter of the invention is shown. The figure shows a control valve according to the invention in axial section in a side view.

In a valve housing 1, the inlet of which is arranged at 2 and its outlet at 3, an exchangeable valve seat 4 is provided, with which a conical Valve closure piece S cooperates, the Via a valve spindle 6 of one which is indicated schematically at 7 and interacts with an actuating device Motor to change the effective flow area is adjustable. The through hole 9 runs coaxially with the valve closure piece 5.

At the bottom of the valve housing 1 is a